Permit Application in Westchester, CA
The permit application is the stage where an ADU project either moves forward on schedule or stalls for months at the Los Angeles Department of Building and Safety. At Ellery ADU Studio, ADU Design & Permitting is not a form we hand off to a third party – it is the core work, assembled in-house from the drawings up. Our permit sets are prepared to LADBS standards, submitted under our project management, and tracked by our team until the approved set comes back stamped.
If you have a site in Westchester and you are weighing an ADU, the permit application process is where most projects run into trouble – incomplete plan sets, missed setback notes, deferred fire sprinkler calculations. We have handled permit submissions across Westchester, Playa del Rey, El Segundo, and the surrounding neighborhoods since 2015, and that track record is the reason our sets move through LADBS review faster than most. Call us at (213) 698-7591 to talk through your site before we write a single line on the drawings. This page is part of our broader ADU Design & Permitting in Westchester practice.
When You Need Permit Application
- You have a garage, basement, or bonus room you want to convert. In Westchester, many homes in the blocks between Sepulveda Boulevard and Lincoln Boulevard were built in the 1950s with detached two-car garages that sit comfortably within JADU and ADU size limits. Converting one without a permit exposes you to stop-work orders and, more seriously, challenges at resale.
- You want to add a new detached ADU to a lot that already has a primary residence. Westchester lots along West 80th and West 84th Streets frequently have rear yard depth that meets the minimum setbacks for a new detached unit, but the permit set has to demonstrate that compliance with dimensions, not assumptions.
- Your existing plans were drawn by a designer who is no longer involved. We regularly receive plan sets where the original designer left the project before permit submission. We review, update to current code, and submit under our documentation – every change logged in the photo record the client receives.
- A previous permit application was rejected or deemed incomplete by LADBS. Incomplete applications in Los Angeles can sit in a correction queue for eight to twelve weeks if the response is not filed correctly. We pick up rejected sets, identify exactly what the plan check correction letter requires, and resubmit with a written scope of what changed.
- You are coordinating a prefab or modular unit and need the permit set to align with the manufacturer’s drawings. Prefab brands like Mighty Buildings and Plant Prefab produce their own structural documents, but the site permit set – foundation plan, utility connections, setback compliance – still has to be prepared locally and submitted to LADBS. We coordinate both sets into one submission.
- Your project is on a hillside, near the coastal zone, or on a lot with a recorded easement. Parts of Westchester near Loyola Marymount and Kentwood sit on slopes or carry easements from older subdivision maps. Those conditions add layers to the permit set that a standard template will miss.
Our Permit Application Process
- Written scope and price before anything starts. Under Haven Standard Clause 1, every project is quoted with a written price before a single drawing is produced. You receive the scope in writing: what is included in the permit set, what agency submissions are covered, and what the timeline looks like based on current LADBS plan check queues. The words “call for a quote” do not appear on this site because the written quote is the first deliverable, not a sales step.
- Site documentation and existing-conditions survey. We visit the property, measure the existing structure and lot, and document everything with a photo record you keep. In Westchester, this step frequently surfaces conditions that change the permit strategy – an existing non-permitted addition, a setback encroachment on the rear yard, or a sewer lateral that runs at an angle that affects ADU placement. Finding these before the drawings start saves weeks.
- Permit-set preparation to LADBS standards. The full permit set includes architectural floor plans, elevations, and sections; a site plan with dimensions to all property lines and structures; a title-24 energy compliance report; structural calculations stamped by a licensed engineer; and all required notes for fire, egress, and accessibility. For projects using a prefab system like Plant Prefab or Mighty Buildings, we incorporate the manufacturer’s stamped structural package into the site submission so LADBS receives one coherent set rather than two documents that reference each other.
- LADBS submission and plan check coordination. We submit the application – either electronically through the LADBS ePlan system or over the counter at the Metro office, depending on project type and current queue times. We track the plan check status, respond to correction letters, and handle any supplemental information requests. Clients receive written updates at each milestone; nothing is communicated verbally and then forgotten.
- Correction response and resubmittal. Most first submissions in Los Angeles receive at least one correction letter. We treat corrections as part of the standard process, not an extra billing event. The response is prepared in writing, the revised sheets are documented in the project photo record, and the resubmittal is filed within the window LADBS specifies. If a correction requires a design change, we explain it to you in plain language before we redraw anything.
- Approved permit set delivered and filed. Once LADBS issues the approved permit set, you receive a complete copy – digital and printed. The approved drawings are the reference document for the entire construction phase. Under the 365-Day Done Right Promise, if the finished ADU is not built to those permitted drawings, we make it right – in writing, before the project starts.
Permit Application Pricing in Westchester
Permit application fees in Westchester break into two categories: what Ellery charges to prepare and manage the submission, and what the City of Los Angeles charges in plan check and permit issuance fees. Both are quoted in writing before work starts.
What Ellery Charges
Permit application and plan set preparation is priced as part of the overall design-build contract, not as a standalone hourly service. Under our one-contract model, the drawings, the permit set, and the construction are a single written price. For context on where permit preparation typically falls within the overall scope:
- Garage conversion ADU (attached or detached) in Westchester: design and permit preparation typically runs $8,000 to $15,000 before construction costs, depending on the complexity of the existing structure and whether structural upgrades are required.
- New detached ADU on a standard Westchester lot: design and permit preparation typically runs $14,000 to $24,000 before construction, with variation driven by unit size, lot conditions, and whether prefab coordination is involved.
- Junior ADU (interior conversion, no addition): design and permit preparation typically runs $6,000 to $10,000, often the simplest permit path in Westchester given the streamlined LADBS process for JADUs under 500 square feet.
These ranges assume a standard residential lot in Westchester without coastal zone overlay, hillside designation, or recorded easements that require additional Site Assessment. If your lot has any of those conditions, the written quote will name the additional scope and cost before you sign anything.
What the City of Los Angeles Charges
LADBS plan check and permit fees are set by the city and paid directly to the city. They are not marked up by Ellery. Current fee schedules for residential ADU projects in Los Angeles generally place plan check fees between $1,200 and $4,500 depending on valuation, and permit issuance fees between $200 and $800. School fees – charged by the Los Angeles Unified School District – are assessed separately and can add $3.00 to $4.79 per square foot of new habitable space. We include estimated city fee totals in the written quote so you are not surprised at the counter.
To get a written price specific to your Westchester property, call (213) 698-7591. The written quote is the first thing you receive – no estimate conditioned on a signed contract, no scope that expands after you commit.
FAQs – Permit Application
How long does the permit application process take for an ADU in Westchester?
Most ADU permit applications in Westchester move through LADBS plan check in eight to fourteen weeks for a first-cycle review, assuming the set is complete at submission. A correction letter adds four to eight weeks for response and recheck. Projects using LADBS pre-approved ADU plans can move faster – sometimes six to ten weeks total – but pre-approved plans come with fixed footprints and may not suit every lot in Westchester, particularly those with irregular setbacks near the 405 corridor or drainage easements in the Kentwood area. We assess which path is faster for your specific parcel before submission and document that recommendation in writing. Call (213) 698-7591 and we can look up the current LADBS queue times for your project type.
Can I use a prefab ADU and still go through the standard permit process in Westchester?
Yes – and we do this regularly. Prefab units from brands like Mighty Buildings and Plant Prefab arrive with manufacturer-stamped structural drawings, but the City of Los Angeles still requires a site-specific permit set covering foundation design, utility connections, setback compliance, and Title 24 Energy Compliance. We prepare the site permit set and coordinate it with the manufacturer’s documents so LADBS receives a single coherent submission. The prefab coordination is included in the written project scope, not billed as an extra. One contract covers the drawings, the permit, and the construction – the same written price throughout.
What happens if LADBS issues a correction letter on my ADU application?
A correction letter from LADBS is a standard part of most plan check cycles in Los Angeles, not a sign that the project is in trouble. LADBS plan checkers flag anything that requires clarification or revision – missing dimensions, unclear notes, details that need to be drawn at a larger scale. When we receive a correction letter, we prepare a written response that addresses each item by number, revise the affected sheets, and resubmit within the specified window. The correction response process is included in the original project scope under Haven Standard Clause 5 – no additional charge for standard plan check corrections. If a correction requires a design change that goes beyond the original scope, we explain it in writing before we act on it.
Do I need a permit for a Junior ADU inside my existing Westchester home?
A permit is required for any Junior ADU in Westchester, even when the conversion involves no addition to the existing footprint. Under California ADU law and LADBS requirements, a JADU permit requires a permit set showing the unit’s floor plan, egress window compliance, the owner-occupancy acknowledgment, and deed restriction recordation. The permit process for a JADU is faster and less expensive than for a full ADU or new detached unit, but skipping the permit creates title problems and exposure to code enforcement. We handle JADU permit sets as part of the same one-contract model – written price, documented photo record, and the 365-Day Done Right Promise covering the finished conversion.
Why the Permit Set Is the Project
Most ADU studios treat the permit set as paperwork between the ADU Design & Blueprints and the build. Ellery was structured around the opposite idea: the permit set is the product the client is actually buying. It is the document that controls what gets built, what the inspector signs off on, and what the title records show when you eventually sell. Every other deliverable – the framing, the finishes, the utility connections – is an execution of what the permit set specifies.
That is why, since 2015, we have submitted over 900 permit sets in the Los Angeles area and built the practice around keeping drawings, permitting, and construction in a single contract at a single written price. When the designer and the builder are the same entity, there is no gap between the approved drawings and what goes up. The 365-Day Done Right Promise is the written form of that commitment: if the finished ADU does not match the permitted drawings, we correct it at no additional cost. That promise is in the contract you sign before work starts.
Westchester homeowners working through this process often find the permit application stage is where they most need a team that has been through it on this specific geography – lots near the flight path from LAX, drainage conditions in the older subdivisions south of Manchester Avenue, and the setback nuances that apply to corner lots on streets like Kentwood Avenue and West 85th Place. That local familiarity is not a marketing line; it is what keeps a submission from coming back with a correction on something that should have been caught in the drawing phase.
If you have a written estimate from another firm, we offer a free second opinion – no obligation, no sales pitch. We will tell you what the estimate includes, what it does not include, and how it compares to what a full permit-set submission actually requires in Westchester. Call (213) 698-7591 to schedule that review, or to get a written project quote for your own site. The quote is free, and it is written before any work begins – that is Haven Standard Clause 1, and it applies to every project we take on.
You can also read about the full scope of how we approach permitting and design together on our home page, which covers the one-contract model and every service category under it.
Written by Nadia Ellery, Owner at Ellery ADU Studio Westchester, serving Westchester.